Mercury proved not to cause autism (again).

Article
This article, from Fox news of all places, discusses a study that shows that mercury in vaccinations, an uncommonly used and commonly quoted additive to vaccines, does not cause autism. Though not the first study disproving a link, the rumor never seems to die, so people continue doing new studies. The kind of mercury that has specifically been called a concern is called ethylmercury. From the article, "The researchers collected urine samples from 54 children with autism spectrum disorders, and compared these with three other groups: 115 children from the general population, 28 children who attended special schools (mainly because of learning disabilities), and 42 children who didn't have autism, but had a sibling with the condition."